Yes! EEVEE Mobility supports adding multiple vehicles to your EEVEE account.
I am a free app user
To add another vehicle to your EEVEE Account, follow these steps:
Go to the settings
Tap Connected cars
Tap the plus-sign
Select the brand you want to add
Follow the on-screen instructions
Your car is now added as a second, third, ... vehicle to your EEVEE account and you can switch between them via the Settings of the app.
I am a EEVEE business user and am linked to a fleet
To add another vehicle to your EEVEE Account, follow these steps:
Go to the settings
Tap Connected cars
Tap the plus-sign
Select the brand you want to add
Follow the on-screen instructions
You will be asked if the newly added vehicle is your new primary vehicle and if it should be linked to the fleet you belong to. You can choose to switch the primary vehicle, or add it as a second vehicle, but it will not be linked to the fleet.